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J&J Worldwide Services Acquisition - Narrative (Details)		3 Months Ended					9 Months Ended
	Feb. 27, 2024 USD ($)	Sep. 30, 2024 USD ($)	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($) acquisition segement	Sep. 30, 2023 USD ($)	Feb. 23, 2024 USD ($)
Business Acquisition [Line Items]
Revenue		$ 9,036,000,000				$ 7,868,000,000	$ 25,363,000,000	$ 22,999,000,000
Operating income		368,000,000				269,000,000	819,000,000	613,000,000
Operational net income		$ 312,000,000				232,000,000	$ 605,000,000	646,000,000
Number of businesses acquired | acquisition							6
Advisory Services
Business Acquisition [Line Items]
Number of businesses acquired | segement							2
Global Workplace Solutions
Business Acquisition [Line Items]
Number of businesses acquired | acquisition							4
5.500% senior notes | Senior Notes
Business Acquisition [Line Items]
Aggregate principal amount									$ 500,000,000
Interest rate		5.50%					5.50%
J&J Worldwide Services
Business Acquisition [Line Items]
Equity interest percentage	100.00%
Deferred consideration, gross	$ 7,000,000
Earnout payment	250,000,000
Goodwill deductible amount		$ 115,000,000					$ 115,000,000
Revenue		115,000,000					262,000,000
Operating income		(3,000,000)					(8,000,000)
Operational net income		(5,000,000)					(8,000,000)
Integration and other costs related to acquisitions		$ 4,000,000	$ 1,000,000	$ 17,000,000	$ 2,000,000
Increased amortization expense						5,000,000	3,000,000	14,000,000
Increased depreciation expense						$ 7,000,000	4,000,000	$ 21,000,000
Payments to acquire business	808,000,000
J&J Worldwide Services | 5.500% senior notes | Senior Notes
Business Acquisition [Line Items]
Aggregate principal amount	$ 500,000,000
Interest rate	5.50%
Other Acquisitions
Business Acquisition [Line Items]
Payments to acquire business							$ 295,000,000

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